It should be obvious to anyone, of course, that the press cannot perform its democratic function if it is unable to communicate in confidence at times with MPs of all parties in Parliament. But that may be more obvious to politicians than those who serve them.
The Prime Minister ought to have been alert to the risk that something like this would happen when he started a witch-hunt over the early release of the Kitteridge report into the GCSB. When he reflects on the continuing saga of embarrassments he might come to the conclusion that the root of it all is his own impulse to launch inquiries into things that do not warrant them.
He could have learned this lesson from the "Teagate" incident at the last election. A misplaced microphone that picked up some tidbits of a discussion that was a staged electoral stunt in any case, became a fully fledged police inquiry of his instigation. His overreaction achieved nothing except to ensure the subject dominated the election at his undoubted cost.
When the Kitteridge report was leaked to a member of the parliamentary press gallery a week before it would have been released anyway, Mr Key put former Inland Revenue Commissioner David Henry on the case.
The PM was naturally angry. He had been on a visit to China and the report, revealing Kim Dotcom was not the only New Zealand resident to have had his communications illegally monitored by the GCSB, was an annoying distraction during a diplomatic mission.
It was no more than that; the report was going to be released anyway. Its leak was inconvenient and no doubt disturbing since it must have come from somebody inside his Government. But that happens; Parliament is an intimate place.
If the inquiry had been concerned with something serious - a security breach that put lives at risk perhaps - its purpose would outweigh other considerations and its methods probably would not be coming under the same scrutiny.
The Prime Minister is being seen as high-handed on a number of issues lately. He may need to remember the weight of his office when next he wants to find out something that is hardly worth his trouble.
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